Partisil was one of the first commercially available irregular porous silicas. A large surface area gives it a high loading capacity. The columns are available with a particle size of 5µm and 10µm. Partisil ODS-2 is a high carbon load C18 bonded silica phase which makes it the most non-polar and, therefore, the most retentive of the Partisil reversed-phase columns. The high sample load capacity is suitable for preparative work.